Physics
Scientific paper
Aug 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989georl..16..911s&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 16, Aug. 1989, p. 911-914.
Physics
8
Dynamo Theory, Field Aligned Currents, Magnetic Field Reconnection, Magnetopause, Three Dimensional Models, Earth Magnetosphere, Energy Dissipation, Lorentz Force, Time Dependence
Scientific paper
The dynamo effect during three-dimensional reconnection is shown to provide an explanation for the diversion and disruption of the magnetopause current, and for the formation of large and small twisted flux transfer event flux tubes at the magnetopause. The dynamo effect is shown to be effective if the level of fluctuations, irregularities, and nonlinearity of the plasma in the reconnection region is high, in which case the turbulent plasma with finite diffusivity can be reorganized to a near force-free and torque-free state in the multiple reconnection sites. An overlap-reconnection-twist dynamo process is proposed. The theory of the conversion and approximate conservation of magnetic helicity during reconnection is used to estimate the average dynamo effect.
Lysak Robert L.
Song Yan
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